Spraying device



Aug. 18, 1936. c R. KING 2,051,382

SPRAYING DEVICE Filed May 17, 1935 mvENTo'R. CEcu. BLSHOF 'Tiznwm mi Patented Aug. 18, 1936 UNITED STATES PATENT. OFFICE Application May 17, 1935, Serial No. 21,987 In Great Britain April 10, 1934 2 Claims.

This invention relates to spraying devices such as are used for example in spraying insecticides and fungicides on to trees and the invention has for its object the provision of an efficient 5 nozzle device for producing a finely divided spray. a

The apparatus according to the invention comprises a nozzle or spraying head composed of a main body made of metal or other suitable 10 material, and a separate member in the form of a nozzle proper which is detachably affixed to said main body. The main body is formed with an elongated passage or mixing chamber into the side of which are led ducts whereby said 15 passage is placed in communication with pipe lines which supply thereto, respectively, an air current and stream of liquid under pressure. Outlet orifices, one or more in number are formed in an end wall of the main body and serve to 20 deliver into the nozzle a mixture of air and liquid. The main body is fitted with an adjustable needle valve for controlling the flow of the liquid, and is provided also with a removable plug or cap at the end remote from the nozzle fitted end to enable the interior of the main body to be cleaned out easily and expeditiously.

A practical embodiment of the invention is illustrated in the accompanying drawing where- 30 Figure 1 is a longitudinal section through the device, and

Figure 2 is a front end View thereof, with the nozzle proper removed.

Referring to the drawing the device comprises 5 a main body 3 cast or otherwise made of metal and of elongated rectangular shape in plan and cross section, a tubular passage 4 which constitutes a mixing chamber being formed in said body at a central position to extend practically 4,0 the full length thereof. Said passage 4 opens at the rear end of the body but is closed normally by a plug 5 screwed into the said end. In the front end wall 6 of the body a hole is formed on the axis of the aforesaid passage, said hole be- 45 ing threaded to receive the threaded clamping rod 1 of a nozzle fitting.

Said nozzle fitting comprises a tubular elbow 8 along one limb of which extends the clamping screw 1 which latter is adapted to project 50 from the outer end of said limb, said projecting end having a head 9 adapted to bear upon the outer surface of the elbow and secure same in position. Said limb of the elbow engages into an annular groove I formed in the end wall of 55 the body. The second limb of the elbow (which is disposed at right angles to the axis of the passage in the main body) has a screw threaded extremity upon which is fitted an end cap ll having formed therein a centrally positioned emission orifice l2 which may be outwardly flared.

In the lower part of the main body there are formed a pair of internally threaded sockets l3 adapted to receive the threaded ends of pipes l4 and I5 through which are supplied respectively, 10 and under pressure, the liquid to be atomized, and air. An inlet orifice I6 formed in the base of each socket leads into the mixing chamber 4. Into the top of the main body is screwed a needle valve I! having a conical extremity which is adapted to pass into a conical mouth of the liquid inlet orifice to regulate the effective size thereof. Said needle I! is provided with a lock-nut l8.

Passages l9 formed in the end of the main body allow the mixture to pass from the mixing chamber 4 into the nozzle proper 8.

It will be understood that the air admitted under pressure into the passage 4 in the main body, will encounter or impinge on the stream of liquid which also is fed into said passage under pressure, and will effect atomization, which latter is assisted by the restricted size of the liquid inlet orifice (controlled by the needle valve ll), the construction afforded by the orifices whereby the main body communicates with the nozzle, and the restricted size of the emission orifice of the nozzle. If necessary provision may be made for controlling the flow of air into the mixing chamber.

The spraying device constructed as above described is economical in use since it will produce an effective spray when using appreciably less liquid than a spraying device or power operated machine of conventional type. Thus, when used to spray insecticides and fungicides, these can be of greater strength without incurring additional expense.

I claim:

1. A spraying device comprising in combina- 4 tion an elongated main body, a bore formed in said body along its axis and terminating short of one end thereof, passages formed in the end wall remaining at one end of said body, an annular groove formed in the outer face of said end wall outside the boundary of the passages therein, an elbow having its inner end seating in said groove, a clamping screw positioned at the axis of the annular groove and engaging into said end wall, said screw serving as a holding means for the elbow and as an axial spindle about which the elbow is adapted to turn, an

axially positioned outlet orifice on the outer end of the elbow for directing an emitted stream perpendicular to the principal axis of the device, valve-controlled liquid inlet and non-controlled air inlet passages formed in the main body and 7 both leading into the bore therein which thereby constitutes a mixing chamber, and a closure plug for fitment'in the open end of said bore.

2. Aspraying device comprising in combination an elongated main body, a bore formed in said body along its axis and terminating short of one end thereof to leave an end wall, an elbow having one limb rotatably mounted on the outer 7 face of said end wall, passages in said end wall for establishing communication between the bore and the elbow, an outlet orifice on the outer end of the elbow for directing an emitted stream 7 

